Congrats on the AB. I've never used the A270, but it looks to be better than the A220 which was my first AB and produced nice results, so I expect that you can do fine things with your new AB. Follow the cleaning and care instructions that came with it. As you become more familiar with your AB, you may find that you can simplify the cleaning regimen.
The real trick to getting a nice finish is proper thinning ratio and air pressure. In my experience, paint consistency varies widely, so you can't really expect to use an exact paint thinning ratio consistently. If you experiment, you'll find it doesn't take too much practice to get the hang of it.
One thing to note is that when you practice, be sure to practice on some scrap styene or other non-porous material such as an plastic milk jug. The reason is that if you practice with something porous like cardboard, it will absorb paints differently than the styrene which is not porous.